Drink Belgian ale at first dance (5)
I believe the answer is:
rumba
'dance' is the definition.
(rumba is a kind of dance)
'drink belgian ale at first' is the wordplay.
'drink' becomes 'rum' (rum is a kind of drink**).
'at first' suggests taking the first letters.
The first letters of 'belgian ale' is 'ba'.
'rum'+'ba'='RUMBA'
(Other definitions for rumba that I've seen before include "music one can dance to" , "Strictly round" , "Caribbean dance" , "Latin American dance" , "South American dance" .)